The pomegranate scientific name Punica granatum L. An alias of pomegranate, pearl pomegranate, pomegranate skin. An Angiosperm shrub or small tree. Take root, bark, flowers, leaves and peels for medicine. With convergence diarrhea, insecticidal function. It is cultivated everywhere.
Symptoms mainly harm flowers, pedicels and fruits. Pedicel and pedicel were infected with brown depression spots, and severe disease flowers fell off earlier. The Department of Fruit Diseases and Diseases turned grayish black, soft and gradually lost water, shrinking and shrinking. At the later stage, it was densely colored with small black spots, ie pathogenic conidia.
Pathogen Zythia versoniana Sacc. Pomegranate fresh shell spores, is a semi-known fungus subphylum fungi. Conidia spheroid, clustered, red, size 56-14462-131 (μm). Conidiophore stems rod-shaped, bundled, size 19-251.5 (μm). Conidia fusiformis, colorless, size 13-193-5 (μm). The sexual state is Nectriella versoniana Sacc.et Penz. Called Pleurotus eryngii, belonging to the fungus Ascomycotina. The asccus shell is brown, with a diameter of 166-277μm and a pod length of 44-65μm. The inner wall is full of periwinkles. Ascospore spindle to stick-shaped, the top wall is extremely thick, without side wires, size 42-538-11 (μm). Ascospores are spindle-shaped, colorless, and 11-144-6 (μm) in size. The optimum growth temperature for germs is 24-28°C, with the highest temperature at 35°C and the lowest temperature at 12.5°C.
Transmission Pathway and Pathogenic Conditions The pathogenic bacteria used for wintering in the diseased part with mycelium or conidia, and a large number of conidia were produced in late spring. The infected host inflicted primary infection and re-infestation by wind and rain, resulting in the spread of the disease. .
Control methods (1) Remove the diseased fruit in time to reduce the bacteria source. (2) Do not spray Baume 3 during dormancy. -5. Lime sulfur or 30% green suspension concentrate 400 times. May-August spray 1:1:200 times Bordeaux mixture or 47% Garethon WP 700 times, 50% thiophanate-methyl wettable powder 700 times, 25% benomyl 800 times .
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